જો $x=\sec \theta-\cos \theta$ અને $y=\sec ^n \theta-\cos ^n \theta$ હોય,તો $\frac{d y}{d x}=$

  • A
    $\sqrt{\frac{y^2+4}{x^2+4}}$
  • B
    $n\sqrt{\frac{y^2+4}{x^2+4}}$
  • C
    $\sqrt{\frac{x^2+4}{y^2+4}}$
  • D
    $n \sqrt{\frac{x^2+4}{y^2+4}}$

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જો $x = a(\cos \theta + \theta \sin \theta)$, $y = f(\theta)$, $f(2\pi) = 0$, $\frac{dy}{dx} = \frac{\tan \theta}{\theta}$, $\theta \neq 0$ અને $\theta \neq (2n+1)\frac{\pi}{2}$ હોય, તો $f\left(\frac{\pi}{3}\right) = $

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